Donald Smith Trial Day 2 Part 1 Medical Examiner Dr Valerie Rao Testifies

TL;DR

DNA analyst examines the evidence collected from the crime scene, including swabs from the victim's body and oral swabs from the suspect, to determine the presence and origin of DNA material.

Transcript

Jerome Bruton je r om e BR you gon yes yes Hilliard for years through Dr Pepper Snapple McCann 15 years yes my uncle louis broum no yes the Northside of Jacksonville off a brown road yes yes yes August of 2013 yes yes yes mr. Bruin let me direct your attention to the screen in front of you and I'm directing your attention to state's exhibit you you... Read More

Key Insights

• 🖐️ The DNA analyst plays a crucial role in examining evidence collected from crime scenes to determine the presence and origin of DNA material.
• 💼 Semen found on the victim's body can provide valuable evidence in sexual assault cases.
• 🧬 The processing of DNA evidence involves multiple steps to extract, amplify, visualize, and compare DNA profiles.
• 🆘 The presence or absence of semen on different swabs helps establish the nature of the crime.

Questions & Answers

Q: How does the DNA analyst determine the presence of semen in the collected swabs?

The analyst conducts color change tests on the swabs, followed by microscopic examination for the visualization of sperm cells.

Q: Were there any differences in the presence of semen between different swabs from the victim's body?

Yes, semen was found in higher amounts on the anal swabs compared to the vaginal and labial swabs.

Q: Did the DNA analysis reveal the presence of semen in the suspect's oral swabs?

No, the suspect's oral swabs did not show any signs of semen.

Q: What steps are involved in the processing of DNA evidence in the laboratory?

The steps include extraction of DNA from the samples, quantification of DNA amount, amplification of specific DNA regions, visualization of DNA profiles, and comparison of profiles with known individuals.

Summary & Key Takeaways

• The DNA analyst receives various items of evidence, including swabs from the victim's body and oral swabs from the suspect, collected during the investigation.

• The analyst conducts tests to identify the presence of biological material, such as semen, and visualizes sperm cells under a microscope.

• Semen is found on the victim's vaginal, anal, and labial swabs, while the suspect's oral swabs show no signs of semen.

• The evidence is then processed for DNA extraction, quantification, amplification, visualization, and comparison with known profiles to determine a match.